Unity - Scripting API:

public SparseTexture(width: int, height: int, format: TextureFormat, mipCount: int)

public SparseTexture(width: int, height: int, format: TextureFormat, mipCount: int, linear: bool)

Parameters

width	Texture width in pixels.
height	Texture height in pixels.
format	Texture format.
mipCount	Mipmap count. Pass -1 to create full mipmap chain.
linear	Whether texture data will be in linear or sRGB color space (default is sRGB).

Create a sparse texture.